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Well, a typical (stock) car gets about 28-33% efficiency (If I remember auto shop correctly). I believe that figure includes things like fuel economy and performance. An engine operating at 100% efficiency could, I suppose make 3-4 times the horsepower and use 3-4 times less fuel durning "normal" operation.

A way to measure efficiency is to check the emissions of the vehicle. If the tailpipe were emitting only water and carbon dioxide, the car would be running 100% efficiently (i.e. it would be achieving 100% combustion of the air/fuel mixture. The more fuel you use successfully, the more power you make). When the engine is blue printed and the friction is reduced, the engine can rev more easily; pistons move up and down in the cylinders with less effort, the crankshaft spins more easily etc. The less resistence there is against a given amount of power, the more work that gets done (over a shorter period of time).

I believe that blueprinting or balancing the engine also allows it to safely rev to a highter redline... but I've only heard that once.

<blockquote data-quote="naaman" data-source="post: 61582" data-attributes="member: 5574">Well, a typical (stock) car gets about 28-33% efficiency (If I remember auto shop correctly).&nbsp; I believe that figure includes things like fuel economy and performance.&nbsp; An engine operating at 100% efficiency could, I suppose make 3-4 times the horsepower and use 3-4 times less fuel durning &quot;normal&quot; operation.A way to measure efficiency is to check the emissions of the vehicle.&nbsp; If the tailpipe were emitting only water and carbon dioxide, the car would be running 100% efficiently (i.e. it would be achieving 100% combustion of the air/fuel mixture.&nbsp; The more fuel you use successfully, the more power you make).&nbsp; When the engine is blue printed and the friction is reduced, the engine can rev more easily; pistons move up and down in the cylinders with less effort, the crankshaft spins more easily etc.&nbsp; The less resistence there is against a given amount of power, the more work that gets done (over a shorter period of time).&nbsp; I believe that blueprinting or balancing the engine also allows it to safely rev to a highter redline... but I&#039;ve only heard that once.</blockquote>

[QUOTE="naaman, post: 61582, member: 5574"] Well, a typical (stock) car gets about 28-33% efficiency (If I remember auto shop correctly). I believe that figure includes things like fuel economy and performance. An engine operating at 100% efficiency could, I suppose make 3-4 times the horsepower and use 3-4 times less fuel durning "normal" operation. A way to measure efficiency is to check the emissions of the vehicle. If the tailpipe were emitting only water and carbon dioxide, the car would be running 100% efficiently (i.e. it would be achieving 100% combustion of the air/fuel mixture. The more fuel you use successfully, the more power you make). When the engine is blue printed and the friction is reduced, the engine can rev more easily; pistons move up and down in the cylinders with less effort, the crankshaft spins more easily etc. The less resistence there is against a given amount of power, the more work that gets done (over a shorter period of time). I believe that blueprinting or balancing the engine also allows it to safely rev to a highter redline... but I've only heard that once. [/QUOTE]

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